Las Vegas-based Allegiant will use proceeds of the debt to purchase 12 Airbus A319s currently on lease to a European carrier that it will add to its fleet in 2018, and eight A319s and three Airbus A320s that it will purchase from GECAS this year and next.

The spread on the $300 million notes was 18bp tighter at 383bp over the benchmark US treasury yield than the last unsecured deal by United, whose $300 million deal priced with a spread of 401bp over benchmark treasuries for a coupon of 6% in November 2013.